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The Catapult is an offense oriented, second-line fire-support BattleMech initially produced on a limited contract for the Terran Hegemony. Its ten tons of armor, fifteen heat sinks and top speed of 64.8 km/h allows the Catapult to deliver its payload of Long Range Missiles on an enemy from great distances without the risk of return fire. The use of four jump jets gives the Catapult a jumping distance of one hundred and twenty meters and the ability to pace faster units over broken terrain. The original Anderson 21 model jump jets tended to break down over prolonged use, venting into the machine's interior and overheating the 'Mech. A general recall in 2566 to replace the 21s with improved Anderson 25s solved the issue, though some Catapults never received this retrofit. The 'Mech is also unique for having a sideways ejection system which, while generally safe, can be quite a surprise to new Catapult pilots.[4][5]

Representing Hollis Incorporated's first foray into the 'Mech market, the Catapult was produced in record numbers over its initial three-year period from the company's brand-new, state-of-the-art factory. However, when the contract came up for review in 2563, the Hegemony decided not to renew it; while the Catapult had performed adequately at its role, it was not quite what they wanted. With large numbers of the 'Mech still in the field, the Catapult would continue to see use in the Star League Defense Force with second-line and specialist formations such as mountaineering regiments. When the factory constructing them switched over to the more-successful BattleMaster, Hollis' limited production of spare parts couldn't keep the design's numbers from dwindling.[4][5]

When the Star League fell, many of the remaining Catapults joined Aleksandr Kerensky on his Exodus. The Capellan Confederation collected most of the Catapults that remained in the Inner Sphere, and the Hollis factory on Corey briefly produced new models and spare parts. At the same time, the Draconis Combine managed to seize a sizable force in their capture of Dieron. The renewed production ended when the Corey factory was destroyed at the onset of the First Succession War, ensuring the rarity of the Catapult during the rest of that bloody era. Entire invasions were commenced simply to seize the remaining number of these 'Mechs, particularly those launched by the Federated Suns against the Confederation.[4][5]

Many variants of this venerable design were produced through its lifetime, and the Catapult's rarity began to reverse in 3033 when Yori 'Mech Works was contracted by the DCMS to produce the completely-revamped CPLT-K2 on Al Na'ir. The greatest change to the chassis came later, with the introduction of the CPLT-C3, which swapped out the original's LRMs for much larger and more powerful artillery missiles. These models were put to excellent use, especially when paired with Ravens, and paved the way for new design advancements.[6]

In the years prior to and after the Clan Invasion, The Confederacy and Combine retained the largest number of existing Catapults, though many Periphery realms would field some of the centuries-old models, and more variants would be produced for decades.[6]

The primary weapons of the Catapult are two Holly LRM-15 launchers which allow the Catapult to give friendly units fire support at ranges of over 600 meters. In case an enemy closes to within the LRM's minimum range the 'Mech carries four Martell Medium Lasers, which are usually enough to dissuade most light and medium 'Mechs from closing with the Catapult. Since the Catapult was designed to stand well behind the main battleline, it lacks anti-infantry weapons or arms for close-quarters combat. Its greatest weakness though is ammunition: only one ton, or eight reloads, for each launchers gives the Catapult a level of endurance which is barely acceptable.[7][4][5]

The A1 variant of the Catapult was designed without back-up weapons. While it doubles the amount of LRM ammo carried and adds on two tons of armor, it is highly susceptible to close range attacks and has little defense if an enemy does manage to close in on it. [5] BV (1.0) = 1,184[2], BV (2.0) = 1,285[8]

CPLT-C1b

The C1b variant is an upgrade of the standard C1 Catapult. The weapon array stays the same, but the ammunition has been doubled. For improved protection, Ferro-Fibrous armor is used. CASE has been added to both torsos. Finally, twelve double strength heat sinks replace the old singles. BV (2.0) = 1570 [9]

CPLT-C2

This Dark Age variant is built using a Hollis Marik III Endo Steel chassis and powered by a Magna 260 extralight engine, using the saved weight to make the C2 a dedicated long range 'Mech. The primary weapons are two Federated LRM-15 launchers mated to an Artemis IV fire control system. The Medium Lasers have been replaced with two Defiance Shredder LB-X Autocannon/2s. While this makes the Catapult vulnerable to close range attacks, it also makes it extremely deadly at long range. BV (1.0) = 1,281[10], BV (2.0) = 1,346[citation needed]

CPLT-C3

The C3 variant takes the 'Mech's long range fire support to a new level by removing both of the LRM-15 launchers and replacing them with an Arrow IV artillery system, allowing the Catapult to stay a safe distance from the battlefield. However the design of this model was rushed through by the Capellans, causing a number of faults to reemerge, including the undependable Anderson 21 jump jets. Chief among these however is the fact that it has a single ton of ammo, giving it a pitiful five reloads and forcing it to stay close to supply lines. The 'Mech is otherwise identical to the C1 model.[5] BV (1.0) = 1,030[2], BV (2.0) = 1,368[11]

CPLT-C4

Replacing the Medium Lasers with a single Small Laser and removing some heat sinks, the -C4 instead carries two LRM-20 launchers with double the amount of ammunition, giving it about twenty five percent more damage capability at long range.[5] BV (1.0) = 1,104[2], BV (2.0) = 1,358[12]

CPLT-C4C

An upgrade of the C4 model. The standard fusion engine is replaced with an extralight engine. With the extra freed tonnage, a large laser and Beagle Active Probe can be mounted. The two Small Lasers are replaced with a single pulse version. The heat sinks are upgraded to double strength models. BV (2.0) = 1,449[13]

CPLT-C5

An upgrade of the C3 model, this variant first appeared during the St. Ives Conflict. It retains the Arrow IV artillery system, but its chassis has been upgraded to Endo Steel and its heat sinks to improved versions. This allows the C5 to increase its armor coverage to twelve and a half tons, upgrade its lasers to ER Medium Lasers, and quadruple the amount of ammo carried with protection provided by CASE.[6] BV (1.0) = 1,329[2], BV (2.0) = 1,748[11]

CPLT-C5A

A variant of the standard CPLT-C5 produced during the Jihad, it removes the Arrow IV system and replaces it with two Artemis IV-enhanced LRM-15 launchers.[14] BV (2.0) = 1,772[15]

CPLT-C6

A field refit of the C5 pressed into service by the Capellans during the Jihad, the C6 removes the artillery and two ER medium lasers to mount paired Plasma Rifles with three tons of ammo and three additional double heat sinks keep heat down. Such was the nature of this refit that even the CASE is still mounted, despite lacking any systems to warrant its use.[6] BV (2.0) = 1,874[11]

CPLT-K2

Breaking the mold of the Catapult, this House Kurita model removes the LRM-15 launchers and replaces them with two PPCs, allowing the Catapult to act as a direct fire support 'Mech and take a more active role in front line combat. The 'Mech mounts five additional single heat sinks to help dissipate the added heat from the PPCs and two Machine Guns to deter infantry attacks. Space is made by removing the jump jets and two of the medium lasers.[4][5] BV (1.0) = 1,052, BV (2.0) = 1,319[16]

CPLT-H2

A Periphery upgrade of the Catapult based upon the K2, the H2 carries a PPC, two Medium Lasers, and eight Rocket Launcher 20s cooled by thirteen heat sinks.[6] BV (1.0) = 1,437[2], BV (2.0) = 1,473[11]

CPLT-K2K

A Dark Age upgrade to the K2 Catapult, the K2K model upgrades the engine to an extralight model. The twin PPCs have also been upgraded to two ER PPCs. The 'Mech also carries two ER Medium Lasers for close range firepower. To handle the added heat from the upgrades, the 'Mech uses 20 double heat sinks. Finally, the K2K model carries thirteen and a half tons of armor. BV (1.0) = 1,500[17], BV (2.0) = 1,716[citation needed]

An upgrade of the prototype K3, this Kuritan variant carries twin Heavy PPCs and ER Medium Lasers, along with seventeen double heat sinks which do an admirable job keeping heat levels down, and a C3 Slave Unit to share targeting telemetry. Built on a standard internal structure and using twelve and a half tons of Light Ferro-Fibrous armor, the designers were forced to use a downgraded Magna 195 fusion engine instead of the normal 260, giving this design a top speed of 56 km/h and a jumping capacity reduced accordingly to ninety meters.[6] BV (1.0) = ??, BV (2.0) = 1,880[11]

CPLT-K5

Another Kuritan variant, the -K5 goes back to its roots by carrying two MRM-30 launchers as its primary weapon. Built on an Endo Steel chassis and utilizing a 260 rated extralight engine for power. It also carries two Medium Pulse Lasers, a C3 Slave Unit and twelve and a half tons of standard armor.[6] BV (1.0) = 1,244[19], BV (2.0) = 1,457[11]

The personal ride of MechWarrior Jenny Templeton, this variant of the Catapult replaces the standard arm-mounted LRM-15s with a quartet of SRM-6 missile launchers, two in each arm.[20] BV (2.0) = 1,242[21]